A thin-walled composite material cylindrical hydraulic tooling structure

Abstract

The present invention relates to the field of tooling technology, and in particular to a thin-walled composite material cylindrical hydraulic tooling structure. Its technical solution includes: a protective part, including a closing plug, an obstruction part, a transfer port, an annular groove and a rubber ring airbag, the inner wall of the plug is slidably connected to the closing plug, the interior of the plug is provided with a transfer port, the closing plug is blocked at the end of the transfer port, an obstruction part that hinders the sliding of the closing plug is provided inside the plug, the end of the transfer port is connected to the rubber ring airbag, and the inner wall of the clamp is provided with an annular groove. After the water pressure test is completed, due to the inertia of water, the thrust received by the closing plug is greater than the obstruction force, thereby displacing water, thereby introducing water into the rubber ring airbag, and the water is contained by the rubber ring airbag to increase the internal area of ​​the cylindrical workpiece, thereby reducing the water pressure received by the cylindrical workpiece, and at the same time, the rubber ring airbag is expanded by water to seal the annular groove, thereby avoiding the problem of water leakage caused by excessive water pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling, and in particular to a thin-wall composite material cylindrical hydraulic tooling structure. Background Art

[0002] The development of composite materials has provided lightweight, high-strength solutions for thin-walled cylindrical fixtures. These materials often exhibit anisotropic properties, providing excellent mechanical properties in specific directions, making them suitable for applications in the marine, aerospace, and other fields. Before use, thin-walled composite cylinders require hydrostatic testing to verify their strength and leak-tightness. Water is pumped into the pipe using a water pump, and during testing, a hydraulic fixture is typically used to secure the cylinder.

[0003] Patent document CN110186771B proposes a hydraulic fixture comprising a connecting rod, a connector having an internal cavity detachably fixed to both ends of the connecting rod, a sealing component detachably fixed to the connector and having a built-in cavity connected to an external hydraulic device, the sealing component being fixed to the outer end of the connector opposite the connecting rod, the built-in cavity being connected to the internal cavity, and the internal cavity having at least one water outlet connected to the outside of the connecting rod. The present invention solves the technical problem of the prior art that it is difficult to seal the connecting pipe orifice when the inner pipe section of the pipe orifice is short and no block is provided on the outer wall of the pipe orifice, and provides a hydraulic fixture for the heating surface tube panel of a waste heat boiler. The present invention has the advantages of simple structure, safety, reliability, and ease of use.

[0004] After the water pressure test, the water pump is turned off to stop injecting water into the cylinder. When the water pump stops suddenly, the inertia of the water flow will cause it to continue flowing forward for a distance, and then flow in the opposite direction due to the constraints of the pipeline, causing pressure fluctuations, which will cause the cylinder to have a pressure that exceeds its test standard, resulting in errors in the experiment. Summary of the Invention

[0005] The purpose of the present invention is to address the problem in the background technology that sudden stop of a water pump causes pressure fluctuations that lead to experimental errors, and to propose a thin-walled composite material cylindrical hydraulic tooling structure.

[0006] The technical solution of the present invention is a thin-walled composite material cylindrical hydraulic tooling structure, which is applied to a cylindrical workpiece, comprising: a clamp is provided at both ends of the cylindrical workpiece, and the two clamps are respectively threadedly connected to a plug and a clamping cylinder;

[0007] The protective member includes a closing plug, an obstruction member, a transfer port, an annular groove, and a rubber ring airbag. The inner wall of the plug is slidably connected to the closing plug. The transfer port is provided inside the plug. The closing plug blocks the end of the transfer port. The obstruction member is provided inside the plug to prevent the closing plug from sliding. The end of the transfer port is connected to the rubber ring airbag. The inner wall of the clamp is provided with an annular groove, and the rubber ring airbag is embedded in the annular groove.

[0008] The rubber ring airbag adopts a circular ring structure, the inner arc surface of the rubber ring airbag is provided with a notch, a pull rod is passed through the center of the cylindrical workpiece, and the end of the pull rod is threadedly connected to the center of the plug.

[0009] Optionally, an arc-shaped opening is provided inside the plug, the arc-shaped opening is connected to the transfer port, the arc-shaped opening adopts a fan-shaped structure, the arc-shaped opening is abutted against the opening of the inner arc surface of the rubber ring airbag, and a first reset spring is elastically connected between the end of the closing plug and the plug.

[0010] Optionally, the obstruction member includes an avoidance groove, an obstruction block and an obstruction spring. An avoidance groove perpendicular to the closing plug is opened inside the plug. The obstruction block is slidably connected in the avoidance groove, and the obstruction spring is elastically connected between the end of the obstruction block and the plug.

[0011] Optionally, the end of the closing plug adopts a truncated cone structure, and the obstruction block is provided with an inclined surface at one end facing the closing plug, and the inclined surface of the obstruction block abuts against the truncated cone end of the closing plug.

[0012] Optionally, a fluctuation limiting component is provided inside the plug, and the fluctuation limiting component includes a hydraulic component, an intermediate tube, a second hydraulic oil pipe and a supplementary cylinder. A hydraulic component is provided at the end of the closing plug, and the hydraulic component is connected to the intermediate tube. The other end of the intermediate tube is connected to the second hydraulic oil pipe. The supplementary cylinder slides in the second hydraulic oil pipe, and the diameter of the supplementary cylinder is the same as the diameter of the closing plug.

[0013] Optionally, a second piston is fixedly installed at the end of the supplementary cylinder, the diameter of the second piston is larger than the diameter of the supplementary cylinder, the end opening diameter of the second hydraulic oil pipe is the same as the diameter of the supplementary cylinder, and the diameter of the second piston is the same as the diameter of the second hydraulic oil pipe.

[0014] Optionally, the hydraulic component includes a push rod, a first hydraulic oil pipe and a first piston. The push rod is fixedly installed at the center of the end of the closing plug. The inner wall of the plug is provided with a first hydraulic oil pipe. The interior of the first hydraulic oil pipe is slidably connected to the first piston. The end of the push rod is inserted into the first hydraulic oil pipe and fixedly connected to the first piston. The first hydraulic oil pipe is connected to the intermediate pipe.

[0015] Optionally, a pull rod is passed through the interior of the cylindrical workpiece, and the two ends of the pull rod are respectively threadedly connected to the plug and the clamping tube, a water inlet is opened at the end of the pull rod, and a water outlet is opened in the middle of the pull rod, and sealing gaskets are fixedly installed inside the plug and the clamping tube.

[0016] Optionally, a positioning assembly is provided at the end of the pull rod, and the positioning assembly includes a water inlet, a slide, a block and a positioning ring. The end of the plug is provided with a water inlet near the threaded connection with the pull rod, and the water inlet is perpendicular to the pull rod. The internal sliding connection of the water inlet is connected to the slide, and the end of the slide is fixedly connected to the block. A positioning ring is provided at the rod body of the pull rod near the threaded position, and the block is clamped with the positioning ring.

[0017] Optionally, a water-sealing hose is fixedly installed on one end of the slide away from the block, the other end of the water-sealing hose is fixedly connected to the water inlet, and a second reset spring is elastically connected between the end of the block away from the pull rod and the plug.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] After the water pressure test of the present invention is completed, the water pump is turned off. Due to the inertia of water, a part of water will continue to flow to the right. At this time, the cylindrical workpiece is not only affected by the water pressure, but also by the force formed by the inertia of water. The thrust received by the closing plug is greater than the resistance force and the workpiece is displaced, thereby introducing water into the rubber ring airbag. The rubber ring airbag contains water to increase the internal area of ​​the cylindrical workpiece and reduce the water pressure received by the cylindrical workpiece. At the same time, the rubber ring airbag is expanded by water to seal the annular groove, thereby avoiding water leakage caused by excessive water pressure.

[0020] Furthermore, since the diameter of the supplementary cylinder is the same as the diameter of the closing plug, when the closing plug moves and expands the internal volume of the cylindrical workpiece, the plug and the clamping cylinder, the supplementary cylinder fills the missing volume. In the process of introducing water into the rubber ring airbag at the transfer port, the water pressure is continuously reduced, thereby avoiding water pressure fluctuations that will cause the pipeline material to undergo repeated stress changes, and fatigue of the pipeline material under long-term action.

[0021] Furthermore, the blocking block is pushed out by water pressure and stuck between the thread on the pull rod and the water inlet, thereby fixing the position of the pull rod and preventing the water pressure from exerting excessive axial force on the plug and the clamping tube, causing the plug and the clamping tube to separate from the pull rod, causing potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Provide a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the pull rod structure in the separated state;

[0024] Figure 3 This is a schematic diagram of the rubber ring airbag structure;

[0025] Figure 4 It is a cross-sectional schematic diagram of the plug structure;

[0026] Figure 5 for Figure 4 A part of the block structure is enlarged schematic diagram;

[0027] Figure 6 for Figure 4 A magnified schematic diagram of the card block structure in part B;

[0028] Figure 7 Schematic diagram of the structure of the first hydraulic oil pipe;

[0029] Figure 8 Schematic diagram of the positioning ring structure.

[0030] Figure numerals: 1. cylindrical workpiece; 2. plug; 3. clamping tube; 4. clamp; 5. pull rod; 6. protective part; 61. closing plug; 62. first return spring; 63. avoidance slide; 64. blocking block; 65. blocking spring; 66. transfer port; 67. arc opening; 68. annular groove; 69. rubber ring airbag; 7. fluctuation limiting assembly; 71. push rod; 72. first hydraulic oil pipe; 73. first piston; 74. intermediate pipe; 75. second hydraulic oil pipe; 76. second piston; 77. supplementary cylinder; 8. positioning assembly; 81. water inlet; 82. slide; 83. water-sealing soft leather hose; 84. block; 85. second return spring; 86. positioning ring. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0033] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] Example 1

[0037] This embodiment proposes a thin-wall composite material cylindrical hydraulic tooling structure, such as Figure 1 As shown, the device is applied to a cylindrical workpiece 1, including a clamp 4 at each end of the cylindrical workpiece 1. The two clamps 4 are respectively threaded with a plug 2 and a clamping tube 3. The plug 2 and the clamp 4 clamp one end of the cylindrical workpiece 1, while the clamping tube 3 and the clamp 4 clamp the other end of the cylindrical workpiece 1. A pressure sensor is installed at the end of the cylindrical workpiece 1 to detect the internal water pressure.

[0038] like Figure 1 and 2 As shown, a pull rod 5 is passed through the interior of the cylindrical workpiece 1, and the two ends of the pull rod 5 are threadedly connected to the plug 2 and the clamping tube 3 respectively. A water inlet is provided at the end of the pull rod 5, and a water outlet is provided in the middle of the pull rod 5. Sealing gaskets are fixedly installed inside the plug 2 and the clamping tube 3. The pull rod 5 uses threads to tighten the hydraulic tooling and the plug with axial force to ensure that no displacement occurs during the hydraulic pressure test. The clamp uses radial force to press the end of the cylinder to ensure that the end of the cylinder does not release pressure during the hydraulic pressure test. By adjusting the pre-tightening force of the pull rod 5, the axial force generated by the plug cover under the action of the internal water pressure can be effectively balanced to prevent the plug cover from displacement or sealing failure and effectively balance the axial force generated by the plug cover under the action of the internal water pressure.

[0039] like Figure 3 and Figure 4As shown, a protective part 6 is provided inside the plug 2, and the protective part 6 includes a closing plug 61, an obstruction member, a transfer port 66, an annular groove 68 and a rubber ring airbag 69. The inner wall of the plug 2 is slidably connected to the closing plug 61, and an obstruction member that hinders the sliding of the closing plug 61 is provided inside the plug 2. The sliding of the closing plug 61 is hindered by the obstruction member. A first return spring 62 is elastically connected between the end of the closing plug 61 and the plug 2. When the pressure of the water pressure acting on the closing plug 61 is greater than the elastic force of the first return spring 62 and the obstruction force of the closing plug 61, the closing plug 61 can move.

[0040] The plug 2 has a transfer port 66 formed inside, and the closing plug 61 blocks the end of the transfer port 66. The end of the transfer port 66 is connected to a rubber ring airbag 69, and an annular groove 68 is formed on the inner wall of the hoop 4, and the rubber ring airbag 69 is embedded in the annular groove 68.

[0041] Water is pumped out by a water pump and injected through the water inlet at the end of the pull rod 5, so that the interior of the cylindrical workpiece 1 is filled with water. After the water pressure test is completed, the water pump is turned off. Due to the inertia of the water, some water will still try to continue to flow to the right, and due to the presence of the plug 2, the water will exert a radial force on the cylindrical workpiece 1 after impacting the plug 2, causing the water pressure on the cylindrical workpiece 1 to be greater than the test standard water pressure, which will cause damage to the cylindrical workpiece 1.

[0042] The standard test water pressure is the same as the obstruction force of the obstruction part on the closing plug 61. After the water pump is turned off, when the water pressure on the cylindrical workpiece 1 is greater than the obstruction force of the obstruction part on the closing plug 61, the closing plug 61 is moved by the water pressure and leaks out of the transfer port 66. Water enters the rubber ring airbag 69 from the transfer port 66. The water expands the rubber ring airbag 69 and completely fills the annular groove 68. The water in the cylindrical workpiece 1 is collected by the rubber ring airbag 69 to prevent the cylindrical workpiece 1 from being subjected to excessive water pressure. At the same time, the rubber ring airbag 69 is filled to block the annular groove 68 to prevent water from leaking from the gap between the plug 2 and the cylindrical workpiece 1 after the water pressure is too high.

[0043] like Figure 4 As shown, an arc-shaped opening 67 is provided inside the plug 2, which is connected to the transfer port 66. The arc-shaped opening 67 adopts a fan-shaped structure. The arc-shaped opening 67 is close to the opening of the inner arc surface of the rubber ring airbag 69 to increase the water inlet area of ​​the rubber ring airbag 69 and avoid the water pressure being concentrated at one point to burst the rubber ring airbag 69.

[0044] like Figure 4 and Figure 5As shown, the obstruction member includes an avoidance chute 63, an obstruction block 64, and an obstruction spring 65. The obstruction chute 63 is defined within the plug 2 and is perpendicular to the closing plug 61. The obstruction block 64 is slidably connected within the obstruction chute 63. The end of the obstruction block 64 is elastically connected to the plug 2 via the obstruction spring 65. The end of the closing plug 61 is truncated cone-shaped. The obstruction block 64 has an inclined surface at one end facing the closing plug 61, and the inclined surface of the obstruction block 64 abuts against the truncated cone end of the closing plug 61. The obstruction spring 65 elastically supports the obstruction block 64, which abuts against the end of the closing plug 61 and prevents the closing plug 61 from sliding. When the water pressure applied to the closing plug 61 exceeds the obstruction force exerted by the obstruction block 64 on the closing plug 61, the closing plug 61 slides.

[0045] In this embodiment, after the water pressure test is completed, the water pump is turned off. Due to the inertia of the water, some water will continue to flow to the right. At this time, the cylindrical workpiece 1 is not only affected by the water pressure, but also by the force formed by the inertia of the water. The thrust received by the closing plug 61 is greater than the resistance force, causing it to displace, thereby introducing water into the rubber ring airbag 69. The rubber ring airbag 69 contains water to increase the internal area of ​​the cylindrical workpiece 1 and reduce the water pressure received by the cylindrical workpiece 1. At the same time, the rubber ring airbag 69 is expanded by water to seal the annular groove 68, thereby avoiding water leakage caused by excessive water pressure.

[0046] Example 2

[0047] Based on Example 1, this example proposes a thin-walled composite material cylindrical hydraulic tooling structure, such as Figure 5 and Figure 7 As shown, the plug 2 is internally provided with a surge limiting assembly 7, which includes a hydraulic component, an intermediate tube 74, a second hydraulic oil pipe 75, and a supplementary cylinder 77. The hydraulic component is provided at the end of the closing plug 61 and is connected to the intermediate tube 74. The other end of the intermediate tube 74 is connected to the second hydraulic oil pipe 75. The supplementary cylinder 77 slides within the second hydraulic oil pipe 75 and has the same diameter as the closing plug 61. A second piston 76 is fixedly mounted at the end of the supplementary cylinder 77. The diameter of the second piston 76 is larger than that of the supplementary cylinder 77. The diameter of the end opening of the second hydraulic oil pipe 75 is the same as that of the supplementary cylinder 77, and the diameter of the second piston 76 is the same as that of the second hydraulic oil pipe 75.

[0048] The hydraulic components include a push rod 71, a first hydraulic oil pipe 72, and a first piston 73. The push rod 71 is fixedly mounted at the center of the end of the closing plug 61. The first hydraulic oil pipe 72 is formed on the inner wall of the plug 2. The interior of the first hydraulic oil pipe 72 is slidably connected to the first piston 73. The end of the push rod 71 penetrates the first hydraulic oil pipe 72 and is fixedly connected to the first piston 73. The first hydraulic oil pipe 72 is connected to the intermediate pipe 74. As the closing plug 61 moves and the push rod 71 pushes the first piston 73, the hydraulic oil in the first piston 73 is pressed into the second hydraulic oil pipe 75, thereby moving the second piston 76 and the replenishing cylinder 77.

[0049] After the closing plug 61 moves, the supplementary cylinder 77 is displaced by the hydraulic pressure. Since the diameter of the supplementary cylinder 77 is the same as the diameter of the closing plug 61, and the distance moved by the closing plug 61 is the same as the distance moved by the supplementary cylinder 77, the volume inside the cylindrical workpiece 1, the plug 2 and the clamping cylinder 3 is maintained.

[0050] In this embodiment, since the diameter of the supplementary cylinder 77 is the same as the diameter of the closing plug 61, when the closing plug 61 moves and expands the internal volume of the cylindrical workpiece 1, the plug 2 and the clamping tube 3, the supplementary cylinder 77 supplements the missing volume. In the process of the transfer port 66 introducing water into the rubber ring airbag 69, the water pressure is continuously reduced, thereby avoiding water pressure fluctuations that will cause the pipeline material to undergo repeated stress changes, and fatigue of the pipeline material under long-term action.

[0051] Example 3

[0052] Based on the above embodiment 1 or embodiment 2, this embodiment proposes a thin-walled composite material cylindrical hydraulic tooling structure, such as Figure 6 and Figure 8 As shown, a positioning assembly 8 is provided at the end of the pull rod 5, and the positioning assembly 8 includes a water inlet 81, a slide 82, a block 84 and a positioning ring 86. The end of the plug 2 opens a water inlet 81 near the threaded connection with the pull rod 5, and the water inlet 81 is perpendicular to the pull rod 5. The inner sliding connection of the water inlet 81 is connected to the slide 82, and the end of the slide 82 is fixedly connected to the block 84. A positioning ring 86 is opened at the rod body of the pull rod 5 and near the threaded position, and the block 84 is clamped with the positioning ring 86.

[0053] During the water pressure test, water enters from the water inlet 81 , and the water pressure acts on the slide 82 and the block 84 , causing the block 84 to be stuck between the thread on the pull rod 5 and the water inlet 81 , thereby fixing the position of the pull rod 5 .

[0054] A water-sealing hose 83 is fixedly mounted on the end of the slide 82 away from the block 84. The other end of the water-sealing hose 83 is fixedly connected to the water inlet 81. A second return spring 85 is elastically connected between the end of the block 84 away from the pull rod 5 and the plug 2. The water-sealing hose 83 prevents water from leaking between the slide 82 and the water inlet 81. The second return spring 85 is used to reset the block 84.

[0055] In this embodiment, the clamping block 84 is pushed out by water pressure and clamped between the thread on the pull rod 5 and the water inlet 81, thereby fixing the position of the pull rod 5 and preventing the water pressure from applying excessive axial force to the plug 2 and the clamping tube 3, causing the plug 2 and the clamping tube 3 to separate from the pull rod 5, causing a dangerous hidden danger.

[0056] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art may make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A thin-walled composite material cylindrical hydraulic tooling structure, applied to a cylindrical workpiece (1), characterized in that: include: Both ends of the cylindrical workpiece (1) are sleeved with a clamping hoop (4), and the two clamping hoops (4) are respectively threadedly connected to a plug (2) and a clamping cylinder (3); The protective member (6) comprises a closing plug (61), an obstruction member, a transfer port (66), an annular groove (68) and a rubber ring airbag (69); the inner wall of the plug (2) is slidably connected to the closing plug (61); the transfer port (66) is provided inside the plug (2); the closing plug (61) is blocked at the end of the transfer port (66); an obstruction member for obstructing the sliding of the closing plug (61) is provided inside the plug (2); the end of the transfer port (66) is connected to the rubber ring airbag (69); the inner wall of the clamp (4) is provided with an annular groove (68); the rubber ring airbag (69) is embedded in the annular groove (68); The obstruction member comprises an avoidance chute (63), an obstruction block (64) and an obstruction spring (65); the obstruction chute (63) perpendicular to the closing plug (61) is provided inside the plug (2); the obstruction block (64) is slidably connected in the avoidance chute (63); and the obstruction spring (65) is elastically connected between the end of the obstruction block (64) and the plug (2); The rubber ring airbag (69) adopts a circular ring structure, and a notch is provided on the inner arc surface of the rubber ring airbag (69). A pull rod (5) is passed through the center of the cylindrical workpiece (1), and the end of the pull rod (5) is threadedly connected to the center of the plug (2).

2. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 1, characterized in that: An arc-shaped opening (67) is provided inside the plug (2), and the arc-shaped opening (67) is communicated with the transfer port (66). The arc-shaped opening (67) adopts a fan-shaped structure, and the arc-shaped opening (67) is close to the opening of the inner arc surface of the rubber ring airbag (69). A first return spring (62) is elastically connected between the end of the closing plug (61) and the plug (2).

3. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 2, characterized in that: The end of the closing plug (61) adopts a truncated cone structure, and the obstruction block (64) is provided with an inclined surface at one end facing the closing plug (61), and the inclined surface of the obstruction block (64) abuts against the truncated cone end of the closing plug (61).

4. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 1, characterized in that: A fluctuation limiting assembly (7) is provided inside the plug (2), and the fluctuation limiting assembly (7) includes a hydraulic component, an intermediate tube (74), a second hydraulic oil pipe (75) and a supplementary cylinder (77). A hydraulic component is provided at the end of the closing plug (61), and the hydraulic component is connected to the intermediate tube (74). The other end of the intermediate tube (74) is connected to the second hydraulic oil pipe (75). The supplementary cylinder (77) slides in the second hydraulic oil pipe (75). The diameter of the supplementary cylinder (77) is the same as that of the closing plug (61).

5. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 4, characterized in that: A second piston (76) is fixedly mounted on the end of the supplementary cylinder (77). The diameter of the second piston (76) is larger than that of the supplementary cylinder (77). The diameter of the end opening of the second hydraulic oil pipe (75) is the same as that of the supplementary cylinder (77). The diameter of the second piston (76) is the same as that of the second hydraulic oil pipe (75).

6. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 5, characterized in that: The hydraulic component includes a push rod (71), a first hydraulic oil pipe (72) and a first piston (73). The push rod (71) is fixedly installed at the center of the end of the closing plug (61). The inner wall of the plug (2) is provided with a first hydraulic oil pipe (72). The interior of the first hydraulic oil pipe (72) is slidably connected to the first piston (73). The end of the push rod (71) penetrates into the first hydraulic oil pipe (72) and is fixedly connected to the first piston (73). The first hydraulic oil pipe (72) is communicated with the intermediate pipe (74).

7. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 1, characterized in that: A pull rod (5) is passed through the interior of the cylindrical workpiece (1), and both ends of the pull rod (5) are threadedly connected to the plug (2) and the clamping tube (3), respectively. A water inlet is provided at the end of the pull rod (5), and a water outlet is provided in the middle of the pull rod (5). Sealing gaskets are fixedly installed inside the plug (2) and the clamping tube (3).

8. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 7, characterized in that: The end of the pull rod (5) is provided with a positioning assembly (8), and the positioning assembly (8) includes a water inlet (81), a slide (82), a clamp (84) and a positioning ring (86). The end of the plug (2) is provided with a water inlet (81) near the threaded connection with the pull rod (5), and the water inlet (81) is perpendicular to the pull rod (5). The interior of the water inlet (81) is slidably connected to the slide (82), and the end of the slide (82) is fixedly connected to the clamp (84). A positioning ring (86) is provided at the rod body of the pull rod (5) and near the threaded position, and the clamp (84) is clamped with the positioning ring (86).

9. The thin-walled composite material cylindrical hydraulic tooling structure according to claim 8, characterized in that: A water-sealing hose (83) is fixedly mounted on one end of the slide (82) away from the clamping block (84), and the other end of the water-sealing hose (83) is fixedly connected to the water inlet (81). A second return spring (85) is elastically connected between the end of the clamping block (84) away from the pull rod (5) and the plug (2).

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